Burglar-alarm



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A. STROMBERG.

13111181.1111 ALARM.

Ne. 484,781. Peteeted oet. 18, 1892.

UNITED STATES PATENT OFFICE.

ALFRED STROMBERG, OF CHICAGO, ILLINOIS.

B URGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 484,761, dated October 18, 1892.

Application filed July 19, 1892. Serial No 440,488. (No model.)

T0 a/ZZ whom it may concern:

Be it known that I, ALFRED STEOMBERG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Burglar-Alarm Protection, (Case No. 5,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to burglar-alarm protection for Windows, doors, and other openings; and its object is to provide for such openings a flexible covering which may be rolled up into small space with facility, but which when stretched over said opening will operate to give an alarm in case any one disturbs it.

My invention consists in a curtain or other iiexible covering, the peculiar means of placing conductors thereon which I employ, and means forattaching the sides, as well as the bottom and top of the curtain to the sides, bottom, and top of the opening to be protected, so as to prevent any movement of the curtain sufficient to admit the hand or body of a person without either opening the circuit or crossing it and thereby sounding the alarm.

My invention is illustrated in the accompanying drawings, in which- Figure 1 shows the flexible covering drawn over the opening with the circuits and connections in diagrammatic form. The frame forming the sides of the opening is also shown partially cut away to show the grooves in which the curtain is adapted to slideand the contact-closing spring. Fig. 2 shows the detail of the attachment to the sides of the curtain which is introduced into the circuit and is adapted to slide in the groove in the side of the frame surrounding the opening. Fig. 3 shows an end of the stick which I employ at the bottom of the flexible covering with thernetal plate or end thereof which is adapted to make contact with the contact-closing device shown in Fig. 1. Fig. 4 shows an alternative form of circuit-closing device for the bottom of the liexible covering. Fig. 5 shows an end circuit-conductor woven into the fabric of the flexible covering, which lnay be used instead of the conductor placed upon the outside of said flexible covering.

Similar letters of reference refer to similar parts of the device throughout the different views.

The circuits which I employ are such as are shownin my application,Serial No. 425,030, and I do not deem it necessary, therefore, to describe them further herein.

The application of the flexible covering and the attachments thereto shown herein can be made to a cabinet such as described in my application, Serial No. 439,489, or it may be used for ordinary windows, doors, and other openings,\vhen desired. I speak of the flexible covering as a curtaing7 but I mean by that to designate any form of flexible covering adapted to the purposes herein set forth. The form which I preferably employ is shown in Fig. l, and consists ot' a curtain ct upon a roller b, the roller being of any Well-known form. The double circuit is distributed over the surface of the curtain, either as shown in Fig. 1 or Fig. 5, and connection to said circuit upon the iiexible covering is made as shown in my application, Serial No. 425,030, or in any Well-known way.

Attached to the sides of the curtain are metal clips c c c c. These metal clips form part of the circuit and have the end d enlarged an'd adapted to slide with the curtain in the slot e, which is formed in the side of the frame and adapted to tit the metal clip. It will be seen at once that the raising of the curtain from the side when it is drawn over the opening to be protected will pull the metal clip from the curtain,thereby breaking the circuit and sounding the alarm.

I do not wish to limit myself to the exact form of metal clip shown, as it is obvious that many other forms may be employed, the only requisite being that the clip shall be free to slide in the same direction as the curtain ordinarily moves, but should not be free to move in any other direction, so that any attempt to move the curtain to one side or the other will result in pulling olf the clip and breaking the circuit. To close the circuit when the curtain is drawn over the opening, I provide either one of the methods shown in Figs. 3 or 4.

The curtain-stick f has a curved plate g upon each end, which curved plate is connected with the circuit distributed over the curtain. The conformation of this plate is such as to engage with the contact-closing spring h and hold the curtain in place, and at the same time close the circuit by contact with a conductor located upon or within the frame i.

The device shown in Fig. 4 consists of the two springs 7c l, borne upon the stem m, which is connected in the circuit carried by the curtain. These springs pass into a recess n in the bottom of the frame and make contact with the plate o. The spring l is of such form that it catches upon plate o and holds the curtain in position at the same time that it closes the circuit by contact with the conductor upon the frame.

I avail myself of a form of curtain which is obtainable in the market in the manner shown in Fig. 5. In this form of curtain a tinsel thread p p p is used and is woven throughout the fabric. With this form of curtain I only need to use a strip ot' tin-foil q along each side of the curtain for one side ot' the circuit. I insure the contact between the tinsel thread used in the manufacture of the fabric by weaving or sewing it through the tin-foil strips q q upon the sides ofthe curtain.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a flexible covering for the protection of openings against the entrance of burglars, the combination, with a curtain carrying a circuit which when openedvor crossed is adapted to sound an alarm, of a metal clip attached to said curtain and forming part of the said circuit and a groove within the frame forming the side or sides of said opening, said clip adaptedto slide in said groove in the direc tion in which the curtain is adapted to move, but to prevent lnotion in any other direction.

2. In burglar-alarm protection,in combination, with curtain a, of the circuits carried thereon,t`rame t', containing the grooves e, the metal clips c c c c, attached to the sides of the curtain and adapted to move in said grooves, the contact-spring h, adapted to make engagement with the said curtain and to connect said circuit with the conductor upon the frames surrounding the opening, substantially as and for the purpose specified.

3. In a burglar-alarm protection, the combination,witl1 the flexible covering, of a circuit carried thereon, a contactmaking device adapted to close said circuit with the main conductor leading to the central station, and clips attached to the side of said flexible covering and adapted to move freely therewith, but to open the circuit when an attempt is made to draw the curtain aside, substantially as and for the purpose specified.

In witness whereof I hereunto subscribe my name this 14th day of July, A. D. 1892.

ALFRED STROMBERG.

Witnesses: v

GEORGE MCMAHON, GEORGE L. ORAGG. 

